A person holds a 10.0 kg lead ball in his hand, a distance of 32.0 cm from the elbow joint, as shown. The biceps, attached at a distance of 2.5 cm from the elbow, exerts an upward force on the forearm. Consider the forearm and hand to be a uniform rod with a mass of 1.50 kg. Calculate the force provided by the biceps muscle in order to hold the arm horizontally as shown. Use the elbow joint as the pivot point. 3.
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- Two people carry a heavy electric motor by placing it on a light board 2.10 mm long. One person lifts at one end with a force of 450 NN, and the other lifts the opposite end with a force of 570 NN. What is the weight of the motor? Express your answer in newtons. Where along the board is its center of gravity located? Express your answer in meters. Suppose the board is not light but weighs 190 NN, with its center of gravity at its center, and the two people each exert the same forces as before. What is the weight of the motor in this case? Express your answer in newtons. Where is its center of gravity located? Express your answer in meters.You open a door by applying a force 1/2 m away from the hinge. The torque you applied was 100 N⋅m. However, the angle at which you pushed the door was 30 degrees from the face of the door. What amount of force did you apply? Please answer in units of newtons and your answer should be exact.A man holds a 198-N ball in his hand, with the forearm horizontal (see the figure). He can support the ball in this position because of the flexor muscle force M, which is applied perpendicular to the forearm. The forearm weighs 18.5 N and has a center of gravity as indicated. Find (a) the magnitude of M and the (b) magnitude and (c) direction (as a positive angle counterclockwise from horizontal) of the force applied by the upper arm bone to the forearm at the elbow joint. Upper arm bone - Flexor muscle M Elbow joint cg 0.0510 mt T0.0890 m 0.330 m-
- (a) When opening a door, you push on it perpendicularly with a force of 44.0 N at a distance of 0.780 m from the hinges. What torque (in N-m) are you exerting relative to the hinges? (Enter the magnitude.) N-m (b) Does it matter if you push at the same height as the hinges? O Yes O NoAn 80 cm long thin rod whose axis of rotation is in the center has a mass of 0.142 kg. A 2.5 N force is applied at one end perpendicularly, while a second 1.5 N force is applied 10 cm from the opposite end. Both forces are applied in the same direction. (a) Find the angular acceleration. (b) Determine the force needed for the rod to be in equilibrium, if the third force is applied at a 300 angle halfway between the 2.5 N and the axis of rotation. (72.6; -5.5)A man is holding a 2.80-kg ball, as shown in the figure. The distance from the elbow joint to the ball is d= 32.5 cm, and the distance from the elbow joint to the insertion of the triceps muscle is d= 2.50cm. The mass of the lower arm, including the hand, is 3.60 kg, and its center of gravity is at a distance d= 13.6cm from the elbow joint. a)Draw a free body diagram of the forearm. b)What is the magnitude of the force FM, exerted by the triceps? c)What is the force exerted by the humerus on the elbow joint?
- A hinged beam, 92.5 kg, is supported by a horizontal cable as in the figure. The length of the cable is 2.00 m and the length of the beam is 3.00 m. Find: (a) the torque produced by gravity on the beam, (b) the tension in the cable, (c) the horizontal and vertical components of the force from the hinge, and (d) the magnitude and direction of the force from the hinge.(a) A woman opens a 1.35 m wide door by pushing on it with a force of 44.5 N applied at the center of the door, at an angle perpendicular to the door's surface. What magnitude of torque (in N · m) is applied about an axis through the hinges? (b) A girl opens the same door, using the same force, again directed perpendicular to the surface, but now the force is applied at the edge of the door. What magnitude of torque (in N · m) is applied about the axis through the hinges now?A man holds a 195-N ball in his hand, with the forearm horizontal (see the figure). He can support the ball in this position because of the flexor muscle force M , which is applied perpendicular to the forearm. The forearm weighs 20.7 N and has a center of gravity as indicated. Find (a) the magnitude of M and the (b) magnitude and (c) direction (as a positive angle counterclockwise from horizontal) of the force applied by the upper arm bone to the forearm at the elbow joint. Upper arm bone- Flexor muscle M Elbow cg joint 0.0510 m+ 0.0890 m -0.330 m- (a) Number i Units (b) Number i Units (c) Number i Units >
- While on a camping trip, a man would like to carry water from the lake to his campsite. He fills two, non-identical buckets with water and attaches them to a 1.51 m long rod. Since the buckets are not identical, he finds that the rod balances about a point located at a length I 0.0367 m from its midpoint, as shown. The weight of the rod and empty buckets is negligible compared to the weight of the water, and the buckets are not shown to scale. Which bucket holds more water? bucket 2 1 bucket 1 They hold the same amount of water. How much more water does the heavier bucket contain, expressed as a percentage? percentage:A 75 kg man's arm, including the hand, can be modeled as a 79-cm-long uniform cylinder with a mass of 3.7 kg. In raising both his arms, from hanging down to straight up, by how much does he raise his center of gravity?Ryan is attempting to curl a 25-kg dumbbell. He manages to get his forearm to a horizontal position, temporarily holding the dumbbell stationary. The forearm is 30 cm in length and has a mass of 4.0 kg. [Consider the forearm to have uniform mass distribution.] The distal biceps tendon is attached to the radius (one of the two bones of the forearm) 5.5 cm from the elbow. Ryan applies maximum force in an attempt to complete the curl, but his tendon ruptures (i.e., tension goes to zero). What is the total moment of inertia about the elbow (after the rupture)? Select one: a. 0.12 kg∙m2. b. 2.25 kg∙m2. c. 2.37 kg∙m2. d. 2.28 kg∙m2.